add two useful handy helpers to render JSON or XML
```php
function jsonAction() {
// rend...

Update and rename model.zep to db.zep

Auth token enhancement

Router, refactor

Pdo, nonexistent-class exception

unused-variable

Auth, password hash enhancement

Di, hook bug fixed #208

1) allow to add hook with specific object context.
2) fixed `$di->clearHooks('no.exists.name')`...

Model, clear save status

If validate fail return `null`, else return insert/update status (`true` for success, `false` fo...

Pdo, add query method

Model, fixed retry to save invalid model bug

Auth, add option to driver

there is no way to add `users` class name option to driver

Invalid model can't be saved even though its has been fixed to valid one

Cli, add websocket component

Auth, make model classes in users configurable

Model, removed unnecessary code